From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S267461AbUBSB6M (ORCPT ); Wed, 18 Feb 2004 20:58:12 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S267454AbUBSB5X (ORCPT ); Wed, 18 Feb 2004 20:57:23 -0500 Received: from hq.pm.waw.pl ([195.116.170.10]:49559 "EHLO hq.pm.waw.pl") by vger.kernel.org with ESMTP id S267453AbUBSB4W (ORCPT ); Wed, 18 Feb 2004 20:56:22 -0500 To: Subject: ACPI and ISA IRQ 9, Linux 2.4 From: Krzysztof Halasa Date: Thu, 19 Feb 2004 02:19:33 +0100 Message-ID: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Hi, I think this is a known problem, but I don't know how to fix it: I have a dual Pentium-2 machine (non-SCSI Asus P2B-D), latest BIOS with ACPI etc. It has an ISA card (serial port) using IRQ 9 (I can't change the IRQ). It works fine without ACPI, Linux 2.4 lists IRQ 9 as APIC edge-triggered. With acpi=force (due to BIOS date) IRQ 9 is used by ACPI. /proc/interrupts lists it as APIC level-triggered, and the ISA card no longer generates interrupts. IRQ 9 is set to "ISA" in BIOS setup. acpi_irq_isa=9 doesn't help. Is is possible to fix it? Or is it just impossible to use ISA IRQ 9 with ACPI? More details available on request, of course. -- Krzysztof Halasa, B*FH